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Employee Benefits (Details Narrative) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Contribution percentage	100.00%
Employee contribution percentage	3.00%
Employee contribution percentage maximum	6.00%
Employee benefits and share-based compensation	$ 1.2	$ 1.5
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee benefits and share-based compensation	$ 0.3	$ 0.3
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage	1.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage	9.00%

X

- Definition

Employee contribution percentage.

+ References

No definition available.

+ Details

Name:	OPTT_EmployeeContributionPercentage
Namespace Prefix:	OPTT_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Employee contribution percentage maximum.

+ References

No definition available.

+ Details

Name:	OPTT_EmployeeContributionPercentageMaximum
Namespace Prefix:	OPTT_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense for employee benefit and equity-based compensation.

+ References

No definition available.

+ Details

Name:	us-gaap_EmployeeBenefitsAndShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PlanNameAxis=OPTT_RetirementPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: